/**

 * $Id: pvr.c,v 1.1 2006-07-11 01:35:23 nkeynes Exp $

 * 

 * PVR support code

 *

 * Copyright (c) 2006 Nathan Keynes.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 */

#include "lib.h"

#include "pvr.h"

#define PVR_BASE 0xA05F8000

#define PVR_RESET    (PVR_BASE+0x008)

#define TA_INIT      (PVR_BASE+0x144)

#define TA_TILESTART (PVR_BASE+0x124)

#define TA_OBJSTART  (PVR_BASE+0x128)

#define TA_TILEEND   (PVR_BASE+0x12C)

#define TA_OBJEND    (PVR_BASE+0x130)

#define TA_TILEPOSN  (PVR_BASE+0x134)

#define TA_OBJPOSN   (PVR_BASE+0x138)

#define TA_SIZE      (PVR_BASE+0x13C)

#define TA_TILECFG   (PVR_BASE+0x140)

#define TA_PLISTSTART (PVR_BASE+0x164)

void ta_init( unsigned int hres, unsigned int vres,

	      unsigned int polybuf, unsigned int polybuflen,

	      unsigned int tilebuf, unsigned int tilebuflen )

{

    unsigned int hsegs = ((hres+31) / 32)-1;

    unsigned int vsegs = ((vres+31) / 32)-1;

    unsigned int size = (vsegs<<16)|hsegs;

    fprintf(stderr, "Setting tilemap: %08X\n", size);

    long_write( PVR_RESET, 1 );

    long_write( PVR_RESET, 0 );

    long_write( TA_SIZE, size );

    long_write( TA_OBJSTART, polybuf & 0x00FFFFFF );

    long_write( TA_OBJEND, (polybuf + polybuflen) & 0x00FFFFFF );

    long_write( TA_TILESTART, (tilebuf + tilebuflen) & 0x00FFFFFF );

    long_write( TA_TILEEND, tilebuf & 0x00FFFFFF );

    long_write( TA_PLISTSTART, (tilebuf + tilebuflen) & 0x00FFFFFF );

    long_write( TA_TILECFG, 0x00100002 );

    long_write( TA_INIT, 0x80000000 );

}

void ta_dump_regs( FILE *f )

{

    fprintf( stderr, "TA Object start[128]: %08X posn[138]: %08X end[130]: %08X\n",

	     long_read(TA_OBJSTART), long_read(TA_OBJPOSN), long_read(TA_OBJEND) );

    fprintf( stderr, "TA OPB start[124]: %08X posn[134]: %08X end[12c]: %08X init: %08X\n",

	     long_read(TA_TILESTART), long_read(TA_TILEPOSN), long_read(TA_TILEEND),

	     long_read(TA_PLISTSTART) );

    fprintf( stderr, "TA Tilesize: %08X  config: %08X\n",  long_read(TA_SIZE), long_read(TA_TILECFG) );

}

int pvr_get_objbuf_size( )

{

    return long_read( TA_OBJPOSN ) - long_read( TA_OBJSTART );

}

void pvr_dump_objbuf( FILE *f )

{

    unsigned int start = long_read( TA_OBJSTART );

    unsigned int posn = long_read( TA_OBJPOSN );

    unsigned int end = long_read( TA_OBJEND );

    char *buf;

    unsigned int length;

    if( start < posn ) {

	buf = (char *)(0xA5000000+start);

	length = posn-start;

    } else {

	buf = (char *)(0xA5000000+end);

	length = start-posn;

    }

    fprintf( f, "Obj buffer: %08X - %08X - %08X\n", start, posn, end );

    fwrite_dump( f, buf, length );

}

void pvr_dump_tilebuf( FILE *f )

{

    unsigned int start = long_read( TA_TILESTART );

    unsigned int posn = long_read( TA_TILEPOSN );

    unsigned int end = long_read( TA_TILEEND );

    char *buf;

    unsigned int length;

    if( start < posn ) {

	buf = (char *)(0xA5000000+start);

	length = posn-start;

    } else {

	buf = (char *)(0xA5000000+end);

	length = start-posn;

    }

    fprintf( f, "Tile buffer: %08X - %08X - %08X\n", start, posn, end );

    fwrite_dump( f, buf, length );

}

/************** Stolen from TATEST *************/

static unsigned int three_d_params[] = {

        0x80a8, 0x15d1c951,     /* M (Unknown magic value) */

        0x80a0, 0x00000020,     /* M */

        0x8008, 0x00000000,     /* TA out of reset */

        0x8048, 0x00000009,     /* alpha config */

        0x8068, 0x02800000,     /* pixel clipping x */

        0x806c, 0x01e00000,     /* pixel clipping y */

        0x8110, 0x00093f39,     /* M */

        0x8098, 0x00800408,     /* M */

        0x804c, 0x000000a0,     /* display align (640*2)/8 */

        0x8078, 0x3f800000,     /* polygon culling (1.0f) */

        0x8084, 0x00000000,     /* M */

        0x8030, 0x00000101,     /* M */

        0x80b0, 0x007f7f7f,     /* Fog table color */

        0x80b4, 0x007f7f7f,     /* Fog vertex color */

        0x80c0, 0x00000000,     /* color clamp min */

        0x80bc, 0xffffffff,     /* color clamp max */

        0x8080, 0x00000007,     /* M */

        0x8074, 0x00000001,     /* cheap shadow */

        0x807c, 0x0027df77,     /* M */

        0x8008, 0x00000001,     /* TA reset */

        0x8008, 0x00000000,     /* TA out of reset */

        0x80e4, 0x00000000,     /* stride width */

        0x6884, 0x00000000,     /* Disable all interrupt events */

        0x6930, 0x00000000,

        0x6938, 0x00000000,

        0x6900, 0xffffffff,     /* Clear all pending int events */

        0x6908, 0xffffffff,

        0x6930, 0x002807ec,     /* Re-enable some events */

        0x6938, 0x0000000e,

        0x80b8, 0x0000ff07,     /* fog density */

        0x80b4, 0x007f7f7f,     /* fog vertex color */

        0x80b0, 0x007f7f7f,     /* fog table color */

        0x8108, 0x00000003      /* 32bit palette  */

};

static unsigned int scrn_params[] = {

        0x80e8, 0x00160000,     /* screen control */

        0x8044, 0x00800000,     /* pixel mode (vb+0x11) */

        0x805c, 0x00000000,     /* Size modulo and display lines (vb+0x17) */

        0x80d0, 0x00000100,     /* interlace flags */

        0x80d8, 0x020c0359,     /* M */

        0x80cc, 0x001501fe,     /* M */

        0x80d4, 0x007e0345,     /* horizontal border */

        0x80dc, 0x00240204,     /* vertical position */

        0x80e0, 0x07d6c63f,     /* sync control */

        0x80ec, 0x000000a4,     /* horizontal position */

        0x80f0, 0x00120012,     /* vertical border */

        0x80c8, 0x03450000,     /* set to same as border H in 80d4 */

        0x8068, 0x027f0000,     /* (X resolution - 1) << 16 */

        0x806c, 0x01df0000,     /* (Y resolution - 1) << 16 */

        0x804c, 0x000000a0,     /* display align */

        0x8118, 0x00008040,     /* M */

        0x80f4, 0x00000401,     /* anti-aliasing */

        0x8048, 0x00000009,     /* alpha config */

        0x7814, 0x00000000,     /* More interrupt control stuff (so it seems)*/

        0x7834, 0x00000000,

        0x7854, 0x00000000,

        0x7874, 0x00000000,

        0x78bc, 0x4659404f,

        0x8040, 0x00000000      /* border color */

};

static void set_regs(unsigned int *values, int cnt)

{

  volatile unsigned char *regs = (volatile unsigned char *)(void *)0xa05f0000;

  unsigned int r, v;

  while(cnt--) {

    r = *values++;

    v = *values++;

    *(volatile unsigned int *)(regs+r) = v;

  }

}

int pvr_check_cable()

{

  volatile unsigned int *porta = (unsigned int *)0xff80002c;

  /* PORT8 and PORT9 is input */

  *porta = (*porta & ~0xf0000) | 0xa0000;

  /* Return PORT8 and PORT9 */

  return ((*(volatile unsigned short *)(porta+1))>>8)&3;

}

void pvr_init_video(int cabletype, int mode, int res)

{

  volatile unsigned int *videobase=(volatile unsigned int *)(void*)0xa05f8000;

  static int bppshifttab[]= { 1,1,0,2 };

  int shift, lines, modulo, words_per_line, vpos;

  int laceoffset=0, voffset=0;

  unsigned int videoflags, attribs;

  unsigned int hvcounter = (res<2? 0x01060359 : 0x020c0359);

  mode &= 3;

  shift = bppshifttab[mode];

  videobase[8/4]=0;

  videobase[0x40/4]=0;

  /* Select pixel clock and colour mode */

  mode = (mode<<2)|1;

  lines = 240;

  if(!(cabletype&2)) {

    /* VGA mode */

    if(res < 2)

      mode |= 2; /* doublescan */

    hvcounter = 0x020c0359;

    lines <<= 1;

    mode |= 0x800000; /* fast pixel clock */

  }

  videobase[0x44/4]=mode;

  /* Set video base address.  Short fields will be offset by

     640 pixels, regardless of horizontal resolution.       */

  videobase[0x50/4]=0;

  videobase[0x54/4]=640<<shift;

  /* Set screen size, modulo, and interlace flag */

  videoflags = 1<<8;

  if(res==0)

    words_per_line=(320/4)<<shift;

  else

    words_per_line=(640/4)<<shift;

  modulo = 1;

  if(!(cabletype&2))

  {

    if(res==0)

      /* VGA lores -> skip 320 pixels to keep modulo at 640 pixels */

      modulo += words_per_line;

  } else {

    if(res!=1)

      /* NTSC lores -> skip 320 pixels to keep modulo at 640 pixels */

      /* _or_ NTSC hires -> skip every other line due to interlace  */

      modulo += words_per_line;

    if(res==2)

      /* interlace mode */

      videoflags |= 1<<4;

    /* enable NTSC */

    videoflags |= 1<<6;

  }

  /* Write screen size and modulo */

  videobase[0x5c/4]=(((modulo<<10)+lines-1)<<10)+words_per_line-1;

  /* Enable video (lace, NTSC) */

  videobase[0xd0/4]=videoflags;

  /* Screen and border position */

  if(!(cabletype&2))

    /* VGA */

    voffset += 36;

  else

    voffset += 18;

  vpos=(voffset<<16)|(voffset+laceoffset);

  videobase[0xf0/4]=vpos;       /* V start              */

  videobase[0xdc/4]=vpos+lines; /* start and end border */

  videobase[0xec/4]=0xa4;       /* Horizontal pos       */

  videobase[0xd8/4]=hvcounter;  /* HV counter           */

  videobase[0xd4/4]=0x007e0345; /* Horizontal border    */

  /* Select horizontal pixel doubling for lowres */

  if(res==0)

    attribs=((22<<8)+1)<<8;

  else

    attribs=22<<16;

  videobase[0xe8/4]=attribs;

  /* Set up vertical blank event */

  vpos = 260;

  if(!(cabletype&2))

    vpos = 510;

  videobase[0xcc/4]=(0x21<<16)|vpos;

  /* Select RGB/CVBS */

  if(cabletype&1)

    mode = 3;

  else

    mode = 0;

  *(volatile unsigned int *)(void*)0xa0702c00 = mode << 8;

  return;

}

void pvr_init()

{

  volatile unsigned int *vbl = (volatile unsigned int *)(void *)0xa05f810c;

  set_regs(three_d_params, sizeof(three_d_params)/sizeof(three_d_params[0])/2);

  while (!(*vbl & 0x01ff));

  while (*vbl & 0x01ff);

  set_regs(scrn_params, sizeof(scrn_params)/sizeof(scrn_params[0])/2);

  pvr_init_video(pvr_check_cable(), 1, 2);

}